Internal-combustion unit in which the four operating cycles - induction, compression, expansion and exhaust - occur during each crankshaft revolution.
A once-common type of engine now found almost exclusively in off-road motorcycles. A two-stroke motor fires once with every two strokes of the piston. 1) Once fired, the downward stroke of the piston delivers power and then draws in a mixture of fuel, air and oil which displaces the exhaust gases in the combustion chamber; 2) the upward stroke compresses the mixture for ignition.
an internal combustion engine which works on two-stroke cycle, ie power is developed for alternate strokes; for the same size and number of cylinders, a two-stroke engine develops almost twice as much power as a four-stroke engine compare four-stroke engine
A more simple engine configuration then a four-stroke, with two elegant cycles of combustion and exhaust. Two stroke engines require far fewer moving parts and so are good for compact layouts needed in lawn trimmers, outboard boat engines and motorcycles. Power tends to be limited to a narrow band, however, making them less suitable for heavy vehicles such as cars.
The most common type of glow engine, one in which the piston travels up and down once to achieve combustion. Where engine requirements for a plane are listed, the 2-stroke range is usually the first (or only) range listed. See also Four-Stroke Engine.
In reciprocating prime movers, one in which the energy is applied once during every complete revolution.